Thanks for the clarification. This is good because T-foils are much easier to build strong enough.

I was about to blow up about my guesses being used as facts but decided to do the calcs instead...lucky...my calcs indicate that a force of about 90kg with a 0.05m^2 foil may be achieved with about 2kg of drag at 20 knots. It's all rough numbers anyway because boats will pitch and heave which will change angles of attack constantly.

I personally think it is going to be exciting being in a class that has this sort of development. I will certainly participate...if it doesn't get banned...

You still haven't explained why you are promoting a banning of rudder foils because of the cost, but then you are promoting a rule which will make expensive carbon masts more favourable, in terms of performance and safety apparently, against the cheaper alternative...?

As I said previously, the rules are good as they are, for the moment. Those that want to develop can do so with very little risk of blowing away those ppl that want to buy a production boat off the shelf. I think it is a good balance at the moment.

If someone doesn't want to be part of a restricted development class, there are other classes more suited to their tastes.